1 /*============================================================================
2 CMake - Cross Platform Makefile Generator
3 Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
5 Distributed under the OSI-approved BSD License (the "License");
6 see accompanying file Copyright.txt for details.
8 This software is distributed WITHOUT ANY WARRANTY; without even the
9 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10 See the License for more information.
11 ============================================================================*/
12 #ifndef cmTargetLinkLibrariesCommand_h
13 #define cmTargetLinkLibrariesCommand_h
15 #include "cmCommand.h"
16 #include "cmDocumentGeneratorExpressions.h"
18 /** \class cmTargetLinkLibrariesCommand
19 * \brief Specify a list of libraries to link into executables.
21 * cmTargetLinkLibrariesCommand is used to specify a list of libraries to link
22 * into executable(s) or shared objects. The names of the libraries
23 * should be those defined by the LIBRARY(library) command(s).
25 class cmTargetLinkLibrariesCommand : public cmCommand
29 * This is a virtual constructor for the command.
31 virtual cmCommand* Clone()
33 return new cmTargetLinkLibrariesCommand;
37 * This is called when the command is first encountered in
38 * the CMakeLists.txt file.
40 virtual bool InitialPass(std::vector<std::string> const& args,
41 cmExecutionStatus &status);
44 * The name of the command as specified in CMakeList.txt.
46 virtual const char* GetName() const { return "target_link_libraries";}
49 * Succinct documentation.
51 virtual const char* GetTerseDocumentation() const
54 "Link a target to given libraries.";
60 virtual const char* GetFullDocumentation() const
63 " target_link_libraries(<target> [item1 [item2 [...]]]\n"
64 " [[debug|optimized|general] <item>] ...)\n"
65 "Specify libraries or flags to use when linking a given target. "
66 "The named <target> must have been created in the current directory "
67 "by a command such as add_executable or add_library. "
68 "The remaining arguments specify library names or flags. "
69 "Repeated calls for the same <target> append items in the order called."
71 "If a library name matches that of another target in the project "
72 "a dependency will automatically be added in the build system to make "
73 "sure the library being linked is up-to-date before the target links. "
74 "Item names starting with '-', but not '-l' or '-framework', are "
75 "treated as linker flags."
77 "A \"debug\", \"optimized\", or \"general\" keyword indicates that "
78 "the library immediately following it is to be used only for the "
79 "corresponding build configuration. "
80 "The \"debug\" keyword corresponds to the Debug configuration "
81 "(or to configurations named in the DEBUG_CONFIGURATIONS global "
82 "property if it is set). "
83 "The \"optimized\" keyword corresponds to all other configurations. "
84 "The \"general\" keyword corresponds to all configurations, and is "
85 "purely optional (assumed if omitted). "
86 "Higher granularity may be achieved for per-configuration rules "
87 "by creating and linking to IMPORTED library targets. "
88 "See the IMPORTED mode of the add_library command for more "
91 "Library dependencies are transitive by default with this signature. "
92 "When this target is linked into another target then the libraries "
93 "linked to this target will appear on the link line for the other "
95 "This transitive \"link interface\" is stored in the "
96 "INTERFACE_LINK_LIBRARIES target property when policy CMP0022 is set "
97 "to NEW and may be overridden by setting the property directly. "
99 "When CMP0022 is not set to NEW, transitive linking is builtin "
100 "but may be overridden by the LINK_INTERFACE_LIBRARIES property. "
101 "Calls to other signatures of this command may set the property "
102 "making any libraries linked exclusively by this signature private."
105 "CMake will also propagate \"usage requirements\" from linked library "
107 "Usage requirements affect compilation of sources in the <target>. "
108 "They are specified by properties defined on linked targets. "
109 "During generation of the build system, CMake integrates "
110 "usage requirement property values with the corresponding "
111 "build properties for <target>:\n"
112 " INTERFACE_COMPILE_DEFINITONS: Appends to COMPILE_DEFINITONS\n"
113 " INTERFACE_INCLUDE_DIRECTORIES: Appends to INCLUDE_DIRECTORIES\n"
114 " INTERFACE_POSITION_INDEPENDENT_CODE: Sets POSITION_INDEPENDENT_CODE\n"
115 " or checked for consistency with existing value\n"
117 "If an <item> is a library in a Mac OX framework, the Headers "
118 "directory of the framework will also be processed as a \"usage "
119 "requirement\". This has the same effect as passing the framework "
120 "directory as an include directory."
121 " target_link_libraries(<target>\n"
122 " <PRIVATE|PUBLIC|INTERFACE> <lib> ...\n"
123 " [<PRIVATE|PUBLIC|INTERFACE> <lib> ... ] ...])\n"
124 "The PUBLIC, PRIVATE and INTERFACE keywords can be used to specify "
125 "both the link dependencies and the link interface in one command. "
126 "Libraries and targets following PUBLIC are linked to, and are "
127 "made part of the link interface. Libraries and targets "
128 "following PRIVATE are linked to, but are not made part of the "
129 "link interface. Libraries following INTERFACE are appended "
130 "to the link interface and are not used for linking <target>."
132 " target_link_libraries(<target> LINK_INTERFACE_LIBRARIES\n"
133 " [[debug|optimized|general] <lib>] ...)\n"
134 "The LINK_INTERFACE_LIBRARIES mode appends the libraries "
135 "to the INTERFACE_LINK_LIBRARIES target property instead of using them "
136 "for linking. If policy CMP0022 is not NEW, then this mode also "
137 "appends libraries to the LINK_INTERFACE_LIBRARIES and its "
138 "per-configuration equivalent. This signature "
139 "is for compatibility only. Prefer the INTERFACE mode instead. "
140 "Libraries specified as \"debug\" are wrapped in a generator "
141 "expression to correspond to debug builds. If policy CMP0022 is not "
142 "NEW, the libraries are also appended to the "
143 "LINK_INTERFACE_LIBRARIES_DEBUG property (or to the properties "
144 "corresponding to configurations listed in the DEBUG_CONFIGURATIONS "
145 "global property if it is set). "
146 "Libraries specified as \"optimized\" are appended to the "
147 "INTERFACE_LINK_LIBRARIES property. If policy CMP0022 is not NEW, "
148 "they are also appended to the LINK_INTERFACE_LIBRARIES property. "
149 "Libraries specified as \"general\" (or without any keyword) are "
150 "treated as if specified for both \"debug\" and \"optimized\"."
152 " target_link_libraries(<target>\n"
153 " <LINK_PRIVATE|LINK_PUBLIC>\n"
154 " [[debug|optimized|general] <lib>] ...\n"
155 " [<LINK_PRIVATE|LINK_PUBLIC>\n"
156 " [[debug|optimized|general] <lib>] ...])\n"
157 "The LINK_PUBLIC and LINK_PRIVATE modes can be used to specify both "
158 "the link dependencies and the link interface in one command. This "
159 "signature is for compatibility only. Prefer the PUBLIC or PRIVATE "
161 "Libraries and targets following LINK_PUBLIC are linked to, and are "
162 "made part of the INTERFACE_LINK_LIBRARIES. If policy CMP0022 is not "
163 "NEW, they are also made part of the LINK_INTERFACE_LIBRARIES. "
164 "Libraries and targets following LINK_PRIVATE are linked to, but are "
165 "not made part of the INTERFACE_LINK_LIBRARIES (or "
166 "LINK_INTERFACE_LIBRARIES)."
168 "The library dependency graph is normally acyclic (a DAG), but in the "
169 "case of mutually-dependent STATIC libraries CMake allows the graph "
170 "to contain cycles (strongly connected components). "
171 "When another target links to one of the libraries CMake repeats "
172 "the entire connected component. "
173 "For example, the code\n"
174 " add_library(A STATIC a.c)\n"
175 " add_library(B STATIC b.c)\n"
176 " target_link_libraries(A B)\n"
177 " target_link_libraries(B A)\n"
178 " add_executable(main main.c)\n"
179 " target_link_libraries(main A)\n"
180 "links 'main' to 'A B A B'. "
182 "While one repetition is usually sufficient, pathological object "
183 "file and symbol arrangements can require more. "
184 "One may handle such cases by manually repeating the component in "
185 "the last target_link_libraries call. "
186 "However, if two archives are really so interdependent they should "
187 "probably be combined into a single archive."
190 "Arguments to target_link_libraries may use \"generator expressions\" "
191 "with the syntax \"$<...>\". Note however, that generator expressions "
192 "will not be used in OLD handling of CMP0003 or CMP0004."
194 CM_DOCUMENT_COMMAND_GENERATOR_EXPRESSIONS
198 cmTypeMacro(cmTargetLinkLibrariesCommand, cmCommand);
200 void LinkLibraryTypeSpecifierWarning(int left, int right);
201 static const char* LinkLibraryTypeNames[3];
204 enum ProcessingState {
205 ProcessingLinkLibraries,
206 ProcessingPlainLinkInterface,
207 ProcessingKeywordLinkInterface,
208 ProcessingPlainPublicInterface,
209 ProcessingKeywordPublicInterface,
210 ProcessingPlainPrivateInterface,
211 ProcessingKeywordPrivateInterface
214 ProcessingState CurrentProcessingState;
216 bool HandleLibrary(const char* lib, cmTarget::LinkLibraryType llt);